Method of making a corrosioninhibiting lubricant



Patented Sept. 15, 1936 UNITED S'iATES PATENT OFFICE METHOD OF MAKING A CORROSION- INHIBITING LUBRICANT No Drawing.

Application March 14, 1934.

Serial No. 715,563 3 Claims. (61.87-9) The present invention relates to the production of lubricants having corrosion-inhibiting properties.

It is well known that in internal combustion engines, for instance, aqueous condensates are formed during the starting period and before the cylinder walls have been heated to about 100-120 C. which condensates in combination with acidic combustion products such as carbon dioxide, formaldehyde, sulphur dioxide, nitrogen oxides etc. have a deleterious corrosive action upon the cylinder walls and the piston rings. In steam engines the cylinder walls etc. are similarly attacked by the acid condensation water.

It is the object of the present invention to provide a lubricant which, when used for lubricating metal parts which are subjected to corrosive actions of the kind referred to, will neutralize the corroding acid constitutents and prevent them 20 from attacking the metal.

The invention is based upon the discovery that certain neutralizing or alkaline substances may be incorporated in oils to form therewith clear and homogeneous mixtures having acid-neutral- 25 izing properties. If such an oil is used as a lubricant in an internal combustion engine, for instance, all the acid combustion products formed will be neutralized, and corrosive action by the same upon the metal surfaces is prevented.

30 In making the corrosion-inhibiting lubricant according to the present invention the neutralizing or alkaline substance is dissolved in a suitable solvent, and the solution thus obtained is added to the lubricant together with a suitable homo- 35 genizing agent. In this way I obtain a clear and homogeneous product having the above mentioned acid-neutralizing properties. The product is quite stable and may be mixed with other oils or fats or fuels in any proportion-Tested with 40 litmus paper it shows a distinct alkaline reaction.

As a neutralizing agent I prefer to use the peroxides of alkaline metals, especially sodium peroxide or potassium peroxide, though other suitable substances may also be used. In making 45 the new lubricant the peroxides are dissolved in a suitable organic solvent, such as an alcohol. A small proportion of this solution is then added to the lubricant together with a homogenizing agent. After thorough mixing a clear and homo- 50 geneous product is obtained. The homogenizing agent used may be any suitable homogenizing agent known per se, such as for instance a hydrogenated phenol or a hydrogenated cresol. As lubricants I may use both mineral, vegetable and animal oils.

Very good results have been obtained by proceeding as follows:-

2 gr. of sodium peroxide are dissolved in 100 com. methanol (CHsOH). I take 2 parts by Weight of this solution and mix them with 2 parts by weight of hydrogenated phenol. This 10 mixture is added to 100 parts by weight of a suitable lubricating oil. In this way we obtain a turbid mixture. Upon addition of another 2 parts by weight of the hydrogenated phenol and stirring the turbid mixture is converted into a clear, homogeneous product.

The corrosion-inhibiting lubricant according to the present invention may be used itself as a lubricant or may be mixed with other lubricants in suitable proportions. Furthermore, it may be added to the fuel which is fed into the cylinders of an internal combustion engine.

It will be understood that the above mentioned figures and proportions are given by way of example only and that they may be varied to meet special requirements without departing from the spirit of the invention.

What I claim is:-

1. A method of making a corrosion-inhibiting top lubricating oil for internal combustion engines, which comprises homogeneously incorporating with a conventional top lubricating oil a relatively small amount of a solution obtained by reacting a peroxide of a fixed alkali with an alcohol.

2. A method of making a corrosion inhibiting top lubricating oil for internal combustion engines, which comprises homogeneously incorporating about 2 parts by weight of a solution obtained by reacting sodium peroxide with methanol substantially in the ratio of 2:100 with 100 parts by weight of a conventional top lubricating oil with the aid of a homogenizing agent.

3. A corrosion-inhibiting top lubricating oil for internal combustion engines, which comprises a conventional top lubricating oil having homogeneously incorporated with it a relatively small amount of a solution obtained by reacting a peroxide of a fixed alkali such as sodium peroxide with an alcohol such as methanol.

CARL MARTIN CLEMENTSON. 

